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Abomination
Abomination 3BlackBlack (5)
Creature — Horror (2/6)

Whenever Abomination blocks or becomes blocked by a green or white creature, destroy that creature at end of combat.

Legends (Uncommon)
Other Versions
Fourth Edition (Uncommon)
Acolyte of the Inferno
Acolyte of the Inferno 2Red (3)
Creature — Human Monk (3/1)

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

Whenever Acolyte of the Inferno becomes blocked by a creature, it deals 2 damage to that creature.

Magic Origins (Uncommon)
Aisling Leprechaun
Aisling Leprechaun Green (1)
Creature — Faerie (1/1)

Whenever Aisling Leprechaun blocks or becomes blocked by a creature, that creature becomes green. (This effect lasts indefinitely.)

Legends (Common)
Ashmouth Hound
Ashmouth Hound 1Red (2)
Creature — Elemental Dog (2/1)

Whenever Ashmouth Hound blocks or becomes blocked by a creature, Ashmouth Hound deals 1 damage to that creature.

Jumpstart (Common)
Other Versions
Innistrad (Common)
Duel Decks: Sorin vs. Tibalt (Common)
Assembled Alphas
Assembled Alphas 5Red (6)
Creature — Wolf (5/5)

Whenever Assembled Alphas blocks or becomes blocked by a creature, Assembled Alphas deals 3 damage to that creature and 3 damage to that creature's controller.

Eldritch Moon (Rare)
Basalt Golem
Basalt Golem 5 (5)
Artifact Creature — Golem (2/4)

Basalt Golem can't be blocked by artifact creatures.

Whenever Basalt Golem becomes blocked by a creature, that creature's controller sacrifices it at end of combat. If the player does, they create a 0/2 colorless Wall artifact creature token with defender.

Mirage (Uncommon)
Battering Ram
Battering Ram 2 (2)
Artifact Creature — Construct (1/1)

At the beginning of combat on your turn, Battering Ram gains banding until end of combat. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's blocking.)

Whenever Battering Ram becomes blocked by a Wall, destroy that Wall at end of combat.

Antiquities (Common)
Other Versions
Fourth Edition (Common)
Fifth Edition (Common)
Catacomb Dragon
Catacomb Dragon 4BlackBlack (6)
Creature — Dragon (4/4)

Flying

Whenever Catacomb Dragon becomes blocked by a nonartifact, non-Dragon creature, that creature gets -X/-0 until end of turn, where X is half the creature's power, rounded down.

Mirage (Rare)
Cockatrice
Cockatrice 3GreenGreen (5)
Creature — Cockatrice (2/4)

Flying

Whenever Cockatrice blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Time Spiral "Timeshifted" (Special)
Other Versions
Limited Edition Alpha (Rare)
Limited Edition Beta (Rare)
Unlimited Edition (Rare)
Revised Edition (Rare)
Fourth Edition (Rare)
Fifth Edition (Rare)
Corrosive Ooze
Corrosive Ooze 1Green (2)
Creature — Ooze (2/2)

Whenever Corrosive Ooze blocks or becomes blocked by an equipped creature, destroy all Equipment attached to that creature at end of combat.

Dominaria (Common)
Deathgazer
Deathgazer 3Black (4)
Creature — Lizard (2/2)

Whenever Deathgazer blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.

Mercadian Masques (Uncommon)
Other Versions
Eighth Edition (Uncommon)
Ninth Edition (Uncommon)
Dread Specter
Dread Specter 3Black (4)
Creature — Specter (2/2)

Whenever Dread Specter blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.

Mirage (Uncommon)
Dream Fighter
Dream Fighter 2Blue (3)
Creature — Human Soldier (1/1)

Whenever Dream Fighter blocks or becomes blocked by a creature, Dream Fighter and that creature phase out. (While they're phased out, they're treated as though they don't exist. Each one phases in before its controller untaps during their next untap step.)

Mirage (Common)
Elven Warhounds
Elven Warhounds 3Green (4)
Creature — Dog (2/2)

Whenever Elven Warhounds becomes blocked by a creature, put that creature on top of its owner's library.

Tempest (Rare)
Engulfing Slagwurm
Engulfing Slagwurm 5GreenGreen (7)
Creature — Wurm (7/7)

Whenever Engulfing Slagwurm blocks or becomes blocked by a creature, destroy that creature. You gain life equal to that creature's toughness.

Scars of Mirrodin (Rare)
Evil Eye of Urborg
Evil Eye of Urborg 4Black (5)
Creature — Eye (6/3)

Non-Eye creatures you control can't attack.

Whenever Evil Eye of Urborg becomes blocked by a creature, destroy that creature.

Time Spiral (Uncommon)
Flailing Drake
Flailing Drake 3Green (4)
Creature — Drake (2/3)

Flying

Whenever Flailing Drake blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn.

Tempest (Uncommon)
Flameheart Werewolf
Flameheart Werewolf (0)
Creature — Werewolf (3/2)

Whenever Flameheart Werewolf blocks or becomes blocked by a creature, Flameheart Werewolf deals 2 damage to that creature.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Flameheart Werewolf.

Shadows over Innistrad (Uncommon)
Gloom Sower
Gloom Sower 5BlackBlack (7)
Creature — Horror (8/6)

Whenever Gloom Sower becomes blocked by a creature, that creature's controller loses 2 life and you gain 2 life.

Core Set 2021 (Common)
Goblin Flotilla
Goblin Flotilla 2Red (3)
Creature — Goblin (2/2)

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

At the beginning of each combat, unless you pay Red, whenever Goblin Flotilla blocks or becomes blocked by a creature this combat, that creature gains first strike until end of turn.

Fallen Empires (Rare)
Gorgon Recluse
Gorgon Recluse 3BlackBlack (5)
Creature — Gorgon (2/4)

Whenever Gorgon Recluse blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.

Madness BlackBlack (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Commander 2019 (Common)
Other Versions
Time Spiral (Common)
Grasping Giant
Grasping Giant 5White (6)
Creature — Giant (5/7)

Vigilance

Whenever Grasping Giant becomes blocked by a creature, exile that creature until Grasping Giant leaves the battlefield.

Theros Beyond Death (Rare)
Gustcloak Savior
Gustcloak Savior 4White (5)
Creature — Bird Soldier (3/4)

Flying

Whenever a creature you control becomes blocked, you may untap that creature and remove it from combat.

Duel Decks: Elspeth vs. Kiora (Rare)
Other Versions
Onslaught (Rare)
Infernal Medusa
Infernal Medusa 3BlackBlack (5)
Creature — Gorgon (2/4)

Whenever Infernal Medusa blocks a creature, destroy that creature at end of combat.

Whenever Infernal Medusa becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Legends (Uncommon)
Inferno Elemental
Inferno Elemental 4RedRed (6)
Creature — Elemental (4/4)

Whenever Inferno Elemental blocks or becomes blocked by a creature, Inferno Elemental deals 3 damage to that creature.

Magic 2010 (Uncommon)
Infinite Authority
Infinite Authority WhiteWhiteWhite (3)
Enchantment — Aura

Enchant creature

Whenever enchanted creature blocks or becomes blocked by a creature with toughness 3 or less, destroy the other creature at end of combat. At the beginning of the next end step, if that creature was destroyed this way, put a +1/+1 counter on the first creature.

Legends (Rare)
Kessig Forgemaster
Kessig Forgemaster 1Red (2)
Creature — Human Shaman Werewolf (2/1)

Whenever Kessig Forgemaster blocks or becomes blocked by a creature, Kessig Forgemaster deals 1 damage to that creature.

At the beginning of each upkeep, if no spells were cast last turn, transform Kessig Forgemaster.

Shadows over Innistrad (Uncommon)
Kolaghan Aspirant
Kolaghan Aspirant 1Red (2)
Creature — Human Warrior (2/1)

Whenever Kolaghan Aspirant becomes blocked by a creature, Kolaghan Aspirant deals 1 damage to that creature.

Dragons of Tarkir (Common)
Lim-Dûl's Cohort
Lim-Dûl's Cohort 1BlackBlack (3)
Creature — Zombie (2/3)

Whenever Lim-Dûl's Cohort blocks or becomes blocked by a creature, that creature can't be regenerated this turn.

Masters Edition IV (Common)
Other Versions
Ice Age (Common)
Mirror Shield
Mirror Shield 2 (2)
Artifact — Equipment

Equipped creature gets +0/+2 and has hexproof and "Whenever a creature with deathtouch blocks or becomes blocked by this creature, destroy that creature."

Equip 2 (2: Attach to target creature you control. Equip only as a sorcery.)

Theros Beyond Death (Uncommon)
Nessian Boar
Nessian Boar 3GreenGreen (5)
Creature — Boar (10/6)

All creatures able to block Nessian Boar do so.

Whenever Nessian Boar becomes blocked by a creature, that creature's controller draws a card.

Theros Beyond Death (Rare)
Ogre Leadfoot
Ogre Leadfoot 4Red (5)
Creature — Ogre (3/3)

Whenever Ogre Leadfoot becomes blocked by an artifact creature, destroy that creature.

Mirrodin (Common)
Ornery Goblin
Ornery Goblin 1Red (2)
Creature — Goblin Warrior (2/1)

Whenever Ornery Goblin blocks or becomes blocked by a creature, Ornery Goblin deals 1 damage to that creature.

Jumpstart (Common)
Other Versions
Guilds of Ravnica (Common)
Phyrexian Reaper
Phyrexian Reaper 4Black (5)
Creature — Zombie (3/3)

Whenever Phyrexian Reaper becomes blocked by a green creature, destroy that creature. It can't be regenerated.

Invasion (Common)
Phyrexian Slayer
Phyrexian Slayer 3Black (4)
Creature — Minion (2/2)

Flying

Whenever Phyrexian Slayer becomes blocked by a white creature, destroy that creature. It can't be regenerated.

Invasion (Common)
Quagmire Lamprey
Quagmire Lamprey 2Black (3)
Creature — Fish (1/1)

Whenever Quagmire Lamprey becomes blocked by a creature, put a -1/-1 counter on that creature.

Mercadian Masques (Uncommon)
Rapid Fire
Rapid Fire 3White (4)
Instant

Cast this spell only before blockers are declared.

Target creature gains first strike until end of turn. If it doesn't have rampage, that creature gains rampage 2 until end of turn. (Whenever the creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it beyond the first.)

Legends (Rare)
Rock Basilisk
Rock Basilisk 4RedGreen (6)
Creature — Basilisk (4/5)

Whenever Rock Basilisk blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Mirage (Rare)
Sawtooth Ogre
Sawtooth Ogre 2RedRed (4)
Creature — Ogre (3/3)

Whenever Sawtooth Ogre blocks or becomes blocked by a creature, Sawtooth Ogre deals 1 damage to that creature at end of combat.

Weatherlight (Common)
Sensei Golden-Tail
Sensei Golden-Tail 1White (2)
Legendary Creature — Fox Samurai (2/1)

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

1White, Tap: Put a training counter on target creature. That creature gains bushido 1 and becomes a Samurai in addition to its other creature types. Activate this ability only any time you could cast a sorcery.

Champions of Kamigawa (Rare)
Shape Stealer
Shape Stealer BlueBlue (2)
Creature — Shapeshifter Spirit (1/1)

Whenever Shape Stealer blocks or becomes blocked by a creature, change Shape Stealer's base power and toughness to that creature's power and toughness until end of turn.

Saviors of Kamigawa (Uncommon)
Somberwald Vigilante
Somberwald Vigilante Red (1)
Creature — Human Warrior (1/1)

Whenever Somberwald Vigilante becomes blocked by a creature, Somberwald Vigilante deals 1 damage to that creature.

Duel Decks: Heroes vs. Monsters (Common)
Other Versions
Avacyn Restored (Common)
Stone-Cold Basilisk
Stone-Cold Basilisk 4Green (5)
Creature — Basilisk (2{1/2}/5)

Whenever Stone-Cold Basilisk blocks or becomes blocked by a creature with fewer letters in its name, destroy that creature at end of combat. (Punctuation and spaces aren't letters.)

Whenever an opponent reads Stone-Cold Basilisk, that player is turned to stone until end of turn. Stoned players can't attack, block, cast spells, or activate abilities.

Unhinged (Uncommon)
Sylvan Basilisk
Sylvan Basilisk 3GreenGreen (5)
Creature — Basilisk (2/4)

Whenever Sylvan Basilisk becomes blocked by a creature, destroy that creature.

Portal Second Age (Rare)
Other Versions
Tenth Edition (Uncommon)
Starter 1999 (Rare)
Talruum Champion
Talruum Champion 4Red (5)
Creature — Minotaur (3/3)

First strike

Whenever Talruum Champion blocks or becomes blocked by a creature, that creature loses first strike until end of turn.

Visions (Common)
Tangle Asp
Tangle Asp 1Green (2)
Creature — Snake (1/2)

Whenever Tangle Asp blocks or becomes blocked by a creature, destroy that creature at end of combat.

Fifth Dawn (Common)
Thicket Basilisk
Thicket Basilisk 3GreenGreen (5)
Creature — Basilisk (2/4)

Whenever Thicket Basilisk blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.

Masters Edition (Uncommon)
Other Versions
Limited Edition Alpha (Uncommon)
Limited Edition Beta (Uncommon)
Unlimited Edition (Uncommon)
Revised Edition (Uncommon)
Fourth Edition (Uncommon)
Fifth Edition (Uncommon)
Classic Sixth Edition (Uncommon)
Tolarian Entrancer
Tolarian Entrancer 1Blue (2)
Creature — Human Wizard (1/1)

Whenever Tolarian Entrancer becomes blocked by a creature, gain control of that creature at end of combat.

Weatherlight (Rare)
Treefolk Mystic
Treefolk Mystic 3Green (4)
Creature — Treefolk (2/4)

Whenever Treefolk Mystic blocks or becomes blocked by a creature, destroy all Auras attached to that creature.

Urza's Legacy (Common)
Venomous Dragonfly
Venomous Dragonfly 3Green (4)
Creature — Insect (1/1)

Flying

Whenever Venomous Dragonfly blocks or becomes blocked by a creature, destroy that creature at end of combat.

Mercadian Masques (Common)
Witherscale Wurm
Witherscale Wurm 4GreenGreen (6)
Creature — Wurm (9/9)

Whenever Witherscale Wurm blocks or becomes blocked by a creature, that creature gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)

Whenever Witherscale Wurm deals damage to an opponent, remove all -1/-1 counters from it.

Shadowmoor (Rare)
Wooden Stake
Wooden Stake 2 (2)
Artifact — Equipment

Equipped creature gets +1/+0.

Whenever equipped creature blocks or becomes blocked by a Vampire, destroy that creature. It can't be regenerated.

Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)

Innistrad (Common)
Zombie Boa
Zombie Boa 4Black (5)
Creature — Zombie Snake (3/3)

1Black: Choose a color. Whenever Zombie Boa becomes blocked by a creature of that color this turn, destroy that creature. Activate this ability only any time you could cast a sorcery.

Apocalypse (Common)